• The Journal of Society for e-Business Studies
• /
• v.12 no.4
• /
• pp.29-36
• /
• 2007

Recently, Jaiswal et al. proposed a protocol to improve the multi-agent negotiation test-bed which was proposed by Collins et al. Using publish/subscribe system, time-release cryptography and anonymous communication, their protocol gives an improvement on the old one. However, it is shown that the protocol also has some security weaknesses: such as replay data attack and DOS (denial-of-service) attack, anonymity disclosure, collusion between customers and a certain supplier. So proposed protocol reduces DOS attack and avoids replay data attack by providing ticket token and deal sequence number to the supplier. And it is proved that the way that market generates random number to the supplier is better than the supplier do by himself in guaranteeing anonymity. Market publishes interpolating polynomial for sharing the determination process data. It avoids collusion between customer and a certain supplie

• Proceedings of the Korea Association of Information Systems Conference
• /
• 2002.11a
• /
• pp.173-181
• /
• 2002

전자상거래의 초창기에는 하나의 사업 모형과 거래 모형에 특화된 거래 형태가 주로 이루어 지다가, 최근에는 한 사이트에서 여러 가지의 사업 모형과 거래 모형을 지원하는 형태로 발전되고 있다. 이러한 추세를 볼 때 앞으로는 더욱 다양한 거래모형이 등장하고 또한 한 marketplace에서 이와 같은 거래모형들을 지원할 수 있어야만 고객의 요구를 충족시킬 수 있을 것으로 예상된다. 이를 위해 본 연구에서는 현실세계에서의 디자인회사와(디자인 판매자) 신발제조업체(디자인 구매자)간의 신발 디자인 거래를 온라인으로 지원함과 동시에 다양한 거래모형을 적용하여 판매자와 구매자의 욕구를 동시에 충족시키고자 하였다. 지원하는 거래모형은 고정가격제(fixed prico), 경매(auction), 구매자가 디자이너에게 특정 디자인을 요청하는 디자인 요구(design request), 그리고 협상(negotiation)이며 디자인 요구란 구매자가 자신이 원하는 디자인을 해 줄 수 있는 디자이너를 구하는 시장이다. 본 연구에서는 신발 디자인 거래 상품으로 Concept design과 Drawing design을 대상으로 하였다.

• Electronics and Telecommunications Trends
• /
• v.38 no.5
• /
• pp.100-113
• /
• 2023

This study was aimed to derive implications in terms of competition to establish a reasonable spectrum policy for fifth-generation (5G) spectrum allocation through an in-depth analysis of C-band spectrum auctions. As a result of examining auctions in five countries, namely, Belgium, Sweden, Canada, Brazil, and Hong Kong, we identified various characteristics. First, the minimum bandwidth that is essential for service competition is guaranteed. Second, in Brazil, the network construction cost of mobile network operators is regarded as a part of the spectrum price. Third, a joint allocation of spectrum is permitted in Sweden, and spectrum sharing after allocation for 5G services is allowed in Canada. Finally, the reserved spectrum is provided for new service providers in Belgium and Canada. Our findings may provide insights for establishing policies of 5G spectrum allocation and competition in the telecommunications service market in Korea.

• Electronics and Telecommunications Trends
• /
• v.38 no.1
• /
• pp.78-79
• /
• 2023

• Journal of Convergence for Information Technology
• /
• v.11 no.2
• /
• pp.31-40
• /
• 2021

Blockchain technology is also actively studied in the real estate transaction field, and real estate transactions have various ways. In this paper, we propose a model that simplifies the authentication procedure of auction systems using Ethereum's Ether to solve the problem of offline court auctions. The proposed model is written in Ethereum's Solidity language, the court registers the sale date and the sale date with the DApp browser, and the bidder accesses the address of the individual's wallet created through Metamask's private key. The bidder then selects the desired sale and enters the bid price amount to participate in the auction. The bidder's record of the highest bid price for the sale he wants is written on the Ethereum test network as a smart contract. and creates a block. Finally, smart contracts written on the network are distributed by the court auction manager to all nodes in the blockchain network, and each node in the blockchain network can be viewed and contract verified. As a result of analyzing the smart contracts of the proposed model and the performance of the system, there are fees incurred due to the creation and use of Ether on platforms using Ethereum, and participation. Ether's changes in value affect the price of the sale, resulting in inconsistent fees in smart contracts each time. However, in future work, we issue our own tokens to solve the market volatility problem and commission problem with the value change of Ether, and refine complex court auction systems.

• The Journal of Society for e-Business Studies
• /
• v.14 no.4
• /
• pp.133-148
• /
• 2009

This study has tried to suggest a new model that can effectively redistribute the tickets in the online ticket resale market, while suggesting a new allocation mechanism based on an agent negotiation. To this end, this study has analyzed an auction in the online ticket resale market through Game theory. As a result of new agent mechanism, it has been proved that the price stability of ticket resale market leads to an increase. An agent negotiation helps to stabilize the ticket prices that are usually inclined to rise at auction, benefiting all the participants in the negotiations, consequently showing a Pareto solution. Especially, a framework for a negotiation process is suggested and domain and processes ontology are designed interrelatedly. With this modeling, a possibility of Ontology based agent negotiation is suggested.

• Electronics and Telecommunications Trends
• /
• v.37 no.5
• /
• pp.70-81
• /
• 2022

This study derived implications regarding competition policy to establish a reasonable spectrum allocation draft of a 3.7 GHz spectrum band by indepth analysis of 5G spectrum auctions. The following general features were identified by examining auctions of three countries, including the United States, United Kingdom, and Denmark, were completed in 2021. First, securing the minimum bandwidth that is essential for service competition was guaranteed by applying the spectrum cap. Second, a continuous spectrum band was allocated to all mobile network operators. Third, certain requirements were implemented to encourage the expansion of 5G service coverage. The spectrum cap that was implemented in Korea during the most recent spectrum auction was ineffective regarding competition policy. Additionally, it is anticipated that the allocation of 3.7-4.0 GHz spectrum will considerably impact market competition because the continuity of spectrum band is different among mobile service operators. Therefore, it is time to discuss promoting the 5G service competition in Korea by revising related laws.

• Electronics and Telecommunications Trends
• /
• v.12 no.3 s.45
• /
• pp.33-41
• /
• 1997

미국의 전파관리 정책은 1990년대에 들어서 새로운 변화를 맞이하고 있다. 특히 경매에 의한 전파통신 사업면허의 부여, 전파사용료(Regulatory Fee)제도의 도입 등과 같은 새로운 제도의 시행과 이러한 제도의 시행을 뒷받침하기 위한 새로운 행정기구의 설립이나 기존 기구의 역할변화 등의 정책변화를 시도하고 있다. 본 논문은 FCC, NTIA 그리고 이들 두 기관사이의 협조와 조화업무를 담당하는 IRAC 등 미국의 전파관리 행정기구의 구성과 역할을 분석하고자 한다. 이러한 분석을 통하여 연방국가인 미국에서의 연방 정부와 민간간의 전파자원 이용에의 조화와 장기적인 전파지원 개발을 위한 각 기구의 노력을 엿볼 수 있다.

• Proceedings of the CALSEC Conference
• /
• 2001.08a
• /
• pp.393-400
• /
• 2001

M-Commerce 정의 정의 -이동 단말기를 이용하여 수행되는 모든 형태의 상거래 -이동 단말기와 통신 네트워크를 이용하여 수행되는 각종 정보, 서비스, 재화에 대한 모든 형태의 상거래 범위 C2C: 개인 대 개인 정보 제공, 채팅 B2C: 기업 대 개인 모바일 뱅킹, 티켓팅, 경매, 쇼핑 B2B: 기업 대 기업 모바일 공급 관리, 물류 관리, 자재 관리 M2M: 기계 대 기계 자동 판매기, 고속도로 톨케이트, 주차장 게이트(중략)

• Proceedings of the CALSEC Conference
• /
• 2001.02a
• /
• pp.273-285
• /
• 2001

◈ 정의 ㆍ 이동 단말기를 이용하여 수행되는 모든 형태의 상거래 ㆍ 이동 단말기와 통신 네트워크를 이용하여 수행되는 각종 정보, 서비스, 재화에 대한 모든 형태의 상거래 ◈ 범위ㆍ C2C: 개인 대 개인 정보제공, 채팅 ㆍ B2C. 기업 대 개인 모바일 뱅킹, 티켓팅 ,경매, 쇼핑 ㆍ B2B: 기업 대 기업 모바일 공급 관리, 물류 관리, 자재 관리 ㆍ M2M: 기계 대 기계 자동 판매기, 고속도로 톨게이트, 주차장 게이트(중략)